Dumb-waiter shaft.



GUSTAVE BADER, OF MONTCLAIR, NEW JERSEY.`

DUMB-WAITER SHAFT.

Bpecication of Letters Patent.

Patented April 16, 1907'.

Application filed Hay 4, 1906. Serial No. 315,126.

plates that are made up in a mold and whichl can be assembled directly into a hollow shaft in such a manner that the blocks form the side Walls of the di1n1bWaiter and ere mede to interlock with each other into a substantiel shaft; and the invention consists in the' novel features of construction and combinations of parts to bc hereinafter described and claimed.

In the accompanying drawings, Figure 1 represents a perspective view of my i1n proved dumb-Waiter shaft, showing the man ner of building up the seme from individual blocks or plates. Fig. 2 is a vertical trans verse section on line 2 2, Fig. 1. Fig. 3 is a erspective view of one of the plates or iilocks employed for the dumb-waiter shaft, and Fig. 4 is an enlarged side view of one of the barbed-wire nails employed for attaching the blocks `forming the Walls ofthe dumbwaiter to each other.

Similar letters of reference indicate corresponding parts in the different figures ol"- the drawings.

Referring to the drawings, a, represents blocks or plates from Which my improved dumb-waiter shaft is made. The blocks are made of plaster-of-peris mixed with fiber or other suitable material and are formed in molds ol the required size. .Plates or blocks of iho same size are used if a square shaft is required, but of different sizes for thefront and roar and for the sides when an oblongv4 shaft is required. Each block c is recessed at its ends f1. for onc-hali of its height at diagonally opposite corners, the remaining unrocesscd portions (1.2, of the sides being provided with holes o for the insertion of the connecting-nails n. The upper edge oi each block c. is provided with a tongue b, and the lower odge with a groove li', so that all the blocks interlock with each other at their adjacent topV and bottom edges, as shown in Fi 2.

ii'hc dumb-waiter shaft is built up 'from the blocks a by using e half-block ax for the front and rear Wall and full-sized blocks e for the side weils and connecting the blocks by driving wire nails n, which are provided with barbed shanksn, as shown in Fig. 4, said nails being driven through the holes o, which ere provided for this purpose at the diagonally op iosite sides of the blocks a. Full-sized blocllrs ere then placed on the half blocks ad' at the front and rear and on the blocks a of the side Wails and again nailed together, course by course, by t e barbedwire nails n. tire shaft is built up.

When oblong shafts are to be made, the iront and rear Walls are made lonrer and the side walls are made shorter. lWhen the shaft is completed, the biocks forming the iront, side, and rear Walls of the same are all .interloc-ked by the tongue-andfrroove joint: at the top and bottom edges and rigidly`con nected with each other by their recessed portions and the Wire nails which are driven through the openings in the unrecessed side portions of the ilocks. i

As the blocks are made in the Afactory ready for use, they can be quick-ly assembled into a shaft by being connected in the manner described, forming 'thereby a strong yet comparatively inexpensive dumb-Waiter shaft.

I'Iaving thus described my invention, I

This is continued until the enl The front and rear blocks thus breek joint with the'side blocks chum as new and desire to secure by Letters Patens- ,A dumb-Waiter shaft of rectangular cross'- section each' Wall of which is formed of e plurality of superposed blocks having cutaway portions or recesses at diagonally opposite upper and lower corners, and projections l'crincdv bv said recesses, the recesses and loro#4 jections of the blocks of each Wall interlock ing respectively with the projections end reccsses of the blocks of the adjacent Well, the

iront and rear blocks breaking joint with the side blocks.

In testimony that I claim the foregoing es my inventionl I have signed my naine in presence oi two subscribing Witnesses.

GUSTAVE BADER. IVitnessfs:

IAUL GOEPEL, HENRY J. SUHRBIER. 

